WO2021251288A1 - 両面銅張積層板 - Google Patents
両面銅張積層板 Download PDFInfo
- Publication number
- WO2021251288A1 WO2021251288A1 PCT/JP2021/021359 JP2021021359W WO2021251288A1 WO 2021251288 A1 WO2021251288 A1 WO 2021251288A1 JP 2021021359 W JP2021021359 W JP 2021021359W WO 2021251288 A1 WO2021251288 A1 WO 2021251288A1
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- WO
- WIPO (PCT)
- Prior art keywords
- resin
- double
- clad laminate
- sided copper
- less
- Prior art date
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- 229920005989 resin Polymers 0.000 claims abstract description 120
- 239000011347 resin Substances 0.000 claims abstract description 120
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 61
- 239000011889 copper foil Substances 0.000 claims abstract description 59
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- 229910044991 metal oxide Inorganic materials 0.000 claims description 7
- 150000004706 metal oxides Chemical class 0.000 claims description 7
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- 229910052719 titanium Inorganic materials 0.000 claims description 6
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- 229920002312 polyamide-imide Polymers 0.000 claims description 5
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- 229910052726 zirconium Inorganic materials 0.000 claims description 5
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- 229920003227 poly(N-vinyl carbazole) Polymers 0.000 claims description 4
- 229920003207 poly(ethylene-2,6-naphthalate) Polymers 0.000 claims description 4
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- 229920006393 polyether sulfone Polymers 0.000 claims description 4
- 239000011112 polyethylene naphthalate Substances 0.000 claims description 4
- 229920000139 polyethylene terephthalate Polymers 0.000 claims description 4
- 239000005020 polyethylene terephthalate Substances 0.000 claims description 4
- 239000004696 Poly ether ether ketone Substances 0.000 claims description 3
- 229910002367 SrTiO Inorganic materials 0.000 claims description 3
- 229910052788 barium Inorganic materials 0.000 claims description 3
- 229920006122 polyamide resin Polymers 0.000 claims description 3
- 229920002530 polyetherether ketone Polymers 0.000 claims description 3
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- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 3
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 3
- 229910052712 strontium Inorganic materials 0.000 claims description 3
- 229910052797 bismuth Inorganic materials 0.000 claims description 2
- 229910052791 calcium Inorganic materials 0.000 claims description 2
- 239000012948 isocyanate Substances 0.000 claims description 2
- 150000002513 isocyanates Chemical class 0.000 claims description 2
- 229910052745 lead Inorganic materials 0.000 claims description 2
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- 239000004416 thermosoftening plastic Substances 0.000 claims description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims 1
- 239000005977 Ethylene Substances 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 27
- 229910052802 copper Inorganic materials 0.000 abstract description 2
- 239000010949 copper Substances 0.000 abstract description 2
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- JNYAEWCLZODPBN-JGWLITMVSA-N (2r,3r,4s)-2-[(1r)-1,2-dihydroxyethyl]oxolane-3,4-diol Chemical compound OC[C@@H](O)[C@H]1OC[C@H](O)[C@H]1O JNYAEWCLZODPBN-JGWLITMVSA-N 0.000 description 1
- LDVVTQMJQSCDMK-UHFFFAOYSA-N 1,3-dihydroxypropan-2-yl formate Chemical compound OCC(CO)OC=O LDVVTQMJQSCDMK-UHFFFAOYSA-N 0.000 description 1
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 1
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Images
Classifications
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
- H05K1/0313—Organic insulating material
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
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- B32B15/00—Layered products comprising a layer of metal
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- B32B15/082—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising vinyl resins; comprising acrylic resins
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- B32B15/088—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyamides
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- B32B15/00—Layered products comprising a layer of metal
- B32B15/20—Layered products comprising a layer of metal comprising aluminium or copper
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/005—Electrodes
- H01G4/008—Selection of materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
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- H01G4/002—Details
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- H01G4/01—Form of self-supporting electrodes
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- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
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- H01G4/18—Organic dielectrics of synthetic material, e.g. derivatives of cellulose
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- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/20—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06
- H01G4/206—Dielectrics using combinations of dielectrics from more than one of groups H01G4/02 - H01G4/06 inorganic and synthetic material
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/33—Thin- or thick-film capacitors
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/02—Details
- H05K1/03—Use of materials for the substrate
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K1/00—Printed circuits
- H05K1/18—Printed circuits structurally associated with non-printed electric components
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
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- B32B2250/00—Layers arrangement
- B32B2250/40—Symmetrical or sandwich layers, e.g. ABA, ABCBA, ABCCBA
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- B32B2307/00—Properties of the layers or laminate
- B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
- B32B2307/204—Di-electric
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/002—Details
- H01G4/018—Dielectrics
- H01G4/06—Solid dielectrics
- H01G4/08—Inorganic dielectrics
- H01G4/12—Ceramic dielectrics
- H01G4/1209—Ceramic dielectrics characterised by the ceramic dielectric material
- H01G4/1218—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates
- H01G4/1227—Ceramic dielectrics characterised by the ceramic dielectric material based on titanium oxides or titanates based on alkaline earth titanates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/35—Feed-through capacitors or anti-noise capacitors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES OR LIGHT-SENSITIVE DEVICES, OF THE ELECTROLYTIC TYPE
- H01G4/00—Fixed capacitors; Processes of their manufacture
- H01G4/40—Structural combinations of fixed capacitors with other electric elements, the structure mainly consisting of a capacitor, e.g. RC combinations
Definitions
- the present invention relates to a double-sided copper-clad laminate.
- Printed wiring boards are widely used in electronic communication devices such as portable electronic devices.
- Capacitors are important to enable noise reduction, but in order to achieve high performance, capacitors are desired to be small and thin enough to be incorporated in the inner layer of a printed wiring board.
- a double-sided copper-clad laminate is used.
- the double-sided copper-clad laminate generally has a structure in which both sides of a resin layer that functions as a dielectric layer are sandwiched between copper foils, and it is important to select more appropriate components for enhancing the functionality of the capacitor. ..
- Patent Document 1 discloses a passive electrical article that can form a pattern for creating an electric circuit.
- the passive electrical article comprises (a) a first self-supporting substrate having two opposing main surfaces, (b) a second self-supporting substrate having two opposing main surfaces, and (c) a polymer.
- a passive electrical article comprising an electrically insulating layer or a conductive layer having a thickness in the range of about 0.5 to about 10 ⁇ m between the first and second substrates.
- the RMS average surface roughness of the main surface of the first base material in contact with these layers and the main surface of the second base material in contact with the layers is in the range of about 10 to about 300 nm, and the RMS average is measured.
- All of z which is the distance above or below the surface of the substrate used to do so, does not exceed half the thickness of the electrically insulating layer or the conductive layer, and the first and second passive electrical articles.
- a passive electrical article is disclosed characterized in that the force required to separate the substrate at a peel angle of 90 ° exceeds about 3 pounds / inch (about 0.5 kN / m).
- Patent Document 2 discloses a dielectric filler-containing resin composition comprising a binder resin and a dielectric filler.
- the binder resin is composed of 20 to 80 parts by weight of epoxy resin (including a curing agent), 20 to 80 parts by weight of an aromatic polyamide resin polymer soluble in an organic solvent, and a curing accelerator added in an appropriate amount as necessary. Become.
- Dielectric filler BaTiO 3, SrTiO 3, Pb (Zr-Ti) O 3, PbLaTiO 3 ⁇ PbLaZrO, SrBi consists 2 Ta 2 any one or more O 9, average particle diameter DIA of 0.1 to 1 It is 0.0 ⁇ m, the weight cumulative particle size D50 by the laser diffraction scattering type particle size distribution measurement method is 0.2 to 2.0 ⁇ m, and the weight cumulative particle size D50 and the average particle size DIA obtained by image analysis are obtained. It is a dielectric powder having a substantially spherical shape and a perovskite structure having a degree of aggregation value of 4.5 or less, which is represented by D50 / DIA.
- Patent Document 3 Patent No. 3770537
- a copper foil layer as a conductor is arranged on the outer layers on both sides, and a resin layer serving as a dielectric is provided between the copper foil layer on one side and the copper foil layer on the other side.
- a capacitor housed in an inner layer portion of a multilayer printed wiring board, which is formed of a double-sided copper-clad laminate having a sandwiched layer structure.
- the resin layer has a three-layer structure in which the layer structure is a thermosetting resin layer / a heat-resistant film layer / a thermosetting resin layer, and the total thickness is 25 ⁇ m or less.
- the thermosetting resin layer is made of an epoxy resin material, and the heat-resistant film layer has normal characteristics such as a Young ratio of 300 kg / mm 2 or more, a tensile strength of 20 kg / mm 2 or more, and a tensile elongation rate of 5% or more. It has a softening temperature higher than the molding temperature of the thermosetting resin constituting the thermosetting resin layers located on both sides, and has a measurement condition of 1 MHz in accordance with paragraph 2.5.5.9 of IPC-TM-650. It is characterized in that it is formed of a double-sided copper-clad laminate made of a resin material which is a heat-resistant film having a relative dielectric constant of 2.5 or more and a thickness of 0.5 to 12.5 ⁇ m.
- Patent No. 5048181 Patent No. 4148501 Patent No. 3770537 WO2015 / 033917A1 WO2003 / 096776A1
- the resin film must be made thicker.
- the resin film portion does not contain a composite oxide such as a filler and has a dielectric property inferior to that of the resin layer, there is a problem that the capacitor capacity decreases when the resin film is made thicker. That is, there is a trade-off relationship between the thickness of the resin film and the capacitor capacity (that is, the capacitance).
- a copper foil with high roughness is generally desired, but as described above, it is not desirable from the viewpoint of withstand voltage.
- the present inventors By controlling the surface texture of the copper foil of the double-sided copper-clad laminate, the present inventors have excellent characteristics in withstand voltage and peel strength while ensuring a high capacitor capacity when used as a capacitor. I got the knowledge that I can demonstrate.
- an object of the present invention is to provide a double-sided copper-clad laminate capable of exhibiting excellent characteristics in withstand voltage resistance and peel strength while ensuring a high capacitor capacity when used as a capacitor.
- the double-sided copper-clad laminate is provided with an adhesive layer and a copper foil on both sides of the resin film in order.
- the resin film is in a cured state at 25 ° C.
- All of the copper foils are provided with a double-sided copper-clad laminate having a maximum mountain height Sp of 0.05 ⁇ m or more and 3.3 ⁇ m or less as measured in accordance with ISO25178 on the surface on the side in contact with the adhesive layer. ..
- the double-sided copper-clad laminate is provided with an adhesive layer and a copper foil on both sides of the resin film in order.
- the resin film is in a cured state at 25 ° C.
- All of the copper foils are provided with a double-sided copper-clad laminate having a root mean square gradient Sdq of 0.01 or more and 2.3 or less on the surface in contact with the adhesive layer, which is measured according to ISO25178. To.
- the "maximum mountain height Sp" is a three-dimensional parameter representing the maximum value of the height from the average surface of the surface, which is measured in accordance with ISO25178.
- the "root mean square gradient Sdq” is a parameter calculated according to the root mean square of the slope at all points in the definition region, which is measured according to ISO25178. That is, since it is a three-dimensional parameter that evaluates the magnitude of the local inclination angle, the roughness of the unevenness of the surface can be quantified. For example, the Sdq of a completely flat surface becomes 0, and if the surface has an inclination, the Sdq becomes large. The Sdq of the plane composed of the inclination component of 45 degrees is 1.
- Kerne Sk is a parameter indicating the sharpness of the height distribution measured according to ISO25178, and is also referred to as sharpness.
- Sku 3 means that the height distribution is a normal distribution, and when Sku> 3, there are many sharp peaks and valleys on the surface, and when Suku ⁇ 3, the surface is flat.
- Double-sided copper-clad laminate The double-sided copper-clad laminate of the present invention is provided with an adhesive layer and a copper foil on both sides of the resin film, respectively.
- the resin film is in a cured state at 25 ° C.
- the maximum mountain height Sp measured according to ISO25178 is 0.05 ⁇ m or more and 3.3 ⁇ m or less on the surface in contact with the adhesive layer, or the square is measured according to ISO25178.
- the mean square root gradient Sdq is 0.01 or more and 2.3 or less. In this way, by controlling Sp or Sdq of the surface of the copper foil on the side in contact with the adhesive layer, that is, by controlling the surface texture of the copper foil, while ensuring a high capacitor capacity when used as a capacitor. , Excellent characteristics in withstand voltage and peel strength can be exhibited.
- the double-sided copper-clad laminate is IPC-TM650-2.4.6.
- the peel strength between the copper foil and the resin film measured according to C is preferably 0.5 kgf / cm or more and 4.0 kgf / cm or less, and more preferably 0.6 kgf / cm or more and 3.5 kgf or less. It is / cm or less, more preferably 0.6 kgf / cm or more and 3.0 kgf / cm or less.
- All of the copper foils included in the double-sided copper-clad laminate of the present invention have a maximum mountain height Sp of 0.05 ⁇ m or more and 3.3 ⁇ m or less measured in accordance with ISO25178 on the surface in contact with the adhesive layer.
- the maximum mountain height Sp is preferably 0.06 ⁇ m or more and 3.1 ⁇ m or less, more preferably 0.06 ⁇ m or more and 3.0 ⁇ m or less, and further preferably 0.07 ⁇ m or more and 2.9 ⁇ m or less.
- the maximum mountain height Sp is more preferably 2.5 ⁇ m or less, further preferably 1.7 ⁇ m or less, and most preferably 1.1 ⁇ m or less. preferable.
- all the copper foils provided in the double-sided copper-clad laminate have a root mean square gradient Sdq of 0.01 or more measured in accordance with ISO25178 on the surface on the side in contact with the adhesive layer. It is 2.3 or less.
- the root mean square gradient Sdq is preferably 0.02 or more and 2.2 or less, more preferably 0.03 or more and 2.0 or less, and further preferably 0.04 or more and 1.8 or less.
- the root mean square gradient Sdq is more preferably 1.6 or less, further preferably 1.3 or less, and more preferably 0.4 or less. Most preferred.
- the Kurtosis Sk measured in accordance with ISO25178 on the surface in contact with the adhesive layer is preferably 2.6 or more and 4.0 or less, more preferably 2.7 or more and 3.8 or less. Hereinafter, it is more preferably 2.7 or more and 3.7 or less.
- the Kurtosis Sk measured in accordance with ISO25178 on the surface in contact with the adhesive layer is preferably 2.6 or more and 4.0 or less, more preferably 2.7 or more and 3.8 or less.
- it is more preferably 2.7 or more and 3.7 or less.
- the thickness of the copper foil is not particularly limited, but is preferably 0.1 ⁇ m or more and 200 ⁇ m or less, more preferably 0.5 ⁇ m or more and 105 ⁇ m or less, and further preferably 1.0 ⁇ m or more and 70 ⁇ m or less.
- a construction method such as a subtractive method, a SAP (semi-additive) method, or an MSAP (modified semi-additive) method, which is a general pattern forming method for wiring of a printed wiring board.
- the combination of the adhesive layer and the resin film provided in the double-sided copper-clad laminate of the present invention preferably has a relative permittivity of 2.5 or more and 30 or less at a frequency of 1 MHz after curing, more preferably 3.0 or more and 27 or less. Below, it is more preferably 3.5 or more and 25 or less. When the relative permittivity is within such a range, a good capacitor capacity can be secured more effectively.
- the resin film preferably has a relative permittivity of 2 or more and 30 or less at a frequency of 1 MHz after curing, more preferably 2.5 or more and 27 or less, and further preferably 3.0 or more and 25 or less.
- the thickness of the resin film is preferably 0.5 ⁇ m or more and 30 ⁇ m or less, more preferably 1.0 ⁇ m or more and 25 ⁇ m or less, and further preferably 1.5 ⁇ m or more and 18 ⁇ m or less.
- the resin film may have to be made thicker.
- the thickness of the resin film can be set within the above range. That is, it is possible to achieve both the thickness of the resin film and the capacity of the capacitor.
- the resin film includes epoxy resin, polyethylene terephthalate, polyethylene naphthalate, polyvinylcarbazole, polyphenylene sulfide, polyimide, polyamide, aromatic polyamide (for example, all aromatic polyamide), polyamideimide, polyether sulfone, polyether nitrile, polyether ether. It is preferable to contain at least one selected from the group consisting of ketones and polytetrafluoroethylene, and more preferably the group consisting of epoxy resin, polyphenylene sulfide, polyimide, polyamide, polyamideimide, and total aromatic polyamide (aramid).
- epoxy resins polyimides, polyamides, and total aromatic polyamides (aramids).
- polyimides polyimides
- polyamides polyamides
- total aromatic polyamides aramids
- examples of commercially available such resin films include para-aramid films, polyimide films and the like.
- a surface roughening treatment it is preferable to apply a surface roughening treatment to the resin film.
- the surface roughening treatment method include plasma treatment, corona discharge treatment, sandblast treatment and the like. By performing such a surface roughening treatment, it is possible to increase the area of the contact interface between the resin film and the adhesive layer, improve the adhesion (peeling strength), and avoid delamination. More preferable surface roughening treatments for resin films include plasma treatments and corona discharge treatments.
- the adhesive layer provided in the double-sided copper-clad laminate of the present invention preferably has a relative permittivity of 2.5 or more and 30 or less at a frequency of 1 MHz after curing, more preferably 3.0 or more and 28.0 or less, still more preferably. Is 4.0 or more and 26 or less.
- the adhesive layer is preferably composed of a resin composition containing a resin component and a dielectric filler.
- This resin component is composed of a thermoplastic component and / or a thermosetting component.
- epoxy resin polyethylene terephthalate resin, polyethylene naphthalate resin, polyvinylcarbazole resin, polyphenylene sulfide resin, polyamide resin, aromatic polyamide resin, polyamideimide resin, polyimide resin, polyether sulfone resin, polyether nitrile resin.
- Polyether ether ketone resin polytetrafluoroethylene resin, urethane resin, isocyanate resin, active ester resin, phenol resin, and diamine compound, preferably at least one selected from the group, more preferably an epoxy resin.
- the adhesive layer preferably further contains a dielectric filler which is a composite metal oxide containing at least two selected from the group consisting of Ba, Ti, Sr, Pb, Zr, La, Ta, Ca and Bi.
- This composite metal oxide more preferably contains at least two selected from the group consisting of Ba, Ti and Sr.
- the composite metal oxide preferably contains at least one selected from the group consisting of BaTiO 3 , SrTIO 3 , Pb (Zr, Ti) O 3 , PbLaTIO 3 , PbLaZrO, and SrBi 2 Ta 2 O 9. It preferably comprises at least one selected from the group consisting of BaTiO 3 and SrTiO 3.
- Pb (Zr, Ti) O 3 means Pb (Zr x Ti 1-x ) O 3 (0 ⁇ x ⁇ 1 in the formula, typically 0 ⁇ x ⁇ 1). By doing so, a double-sided copper-clad laminate that provides a good capacitor capacity can be obtained more effectively.
- the dielectric filler is preferably contained in an amount of 0 parts by weight or more and 90 parts by weight or less, more preferably 15 parts by weight or more, based on 100 parts by weight of the solid content of the resin composition. It is contained in an amount of 85 parts by weight or less, more preferably 25 parts by weight or more and 80 parts by weight or less.
- the particle size of the dielectric filler which is a composite metal oxide, is not particularly limited, but from the viewpoint of maintaining the adhesion between the adhesive layer and the copper foil, the average particle size D 50 measured by the laser diffraction scattering type particle size distribution measurement is used. It is preferably 0.001 ⁇ m or more and 2.0 ⁇ m or less, more preferably 0.01 ⁇ m or more and 1.8 ⁇ m or less, and further preferably 0.03 ⁇ m or more and 1.6 ⁇ m or less.
- the resin composition may further contain a filler dispersant.
- a filler dispersant By further containing the filler dispersant, the dispersibility of the dielectric filler can be improved when the resin varnish and the dielectric filler are kneaded.
- the filler dispersant known ones that can be used can be appropriately used, and the filler dispersant is not particularly limited.
- preferable filler dispersants include phosphonic acid type, cationic type, carboxylic acid type and anion type dispersants which are ionic dispersants, as well as ether type, ester type and sorbitan sell type which are nonionic dispersants. , Diester type, monoglyceride type, ethylene oxide addition type, ethylenediamine-based type, phenol type dispersant and the like.
- Other examples include coupling agents such as silane coupling agents, titanate coupling agents, and aluminate coupling agents.
- a curing accelerator may be added to the resin composition in order to accelerate the curing of the resin component.
- Preferred examples of the curing accelerator include an imidazole-based curing accelerator and an amine-based curing accelerator.
- the content of the curing accelerator is 0.01 part by weight or more with respect to 100 parts by weight of the non-volatile component in the resin composition from the viewpoint of storage stability and efficiency of curing of the resin component contained in the resin composition. It is preferably 0 parts by weight or less, more preferably 0.1 parts by weight or more and 2.0 parts by weight or less.
- the resin composition constituting the adhesive layer is made into a copper foil by using a gravure coating method so that the thickness of the adhesive layer after drying becomes a predetermined value. Obtained by coating and drying.
- the coating method is arbitrary, but a die coating method, a knife coating method, or the like can be adopted in addition to the gravure coating method. In addition, it is also possible to apply using a doctor blade, a bar coater, or the like.
- Examples 1-9 (1) Preparation of resin varnish First, as raw material components for resin varnish, the following resin components and imidazole-based curing accelerators were prepared.
- -Biphenyl-Aralkyl type epoxy resin manufactured by Nippon Kayaku Co., Ltd., NC-3000 -Polyfunctional phenolic resin (hardener): MEH-7500, manufactured by Meiwa Kasei Co., Ltd.
- -Phenolic hydroxyl group-containing polybutadiene-modified aromatic polyamide resin Nippon Kayaku Co., Ltd., BPAM-155 -Imidazole-based epoxy resin curing accelerator: manufactured by Shikoku Kasei Kogyo Co., Ltd., 2P4MHZ
- the raw material components for the resin varnish were weighed at the compounding ratios (weight ratios) shown in Tables 1A and 1B. Then, the cyclopentanone solvent was weighed, the raw material component for the resin varnish and the cyclopentanone solvent were put into a flask, and the mixture was stirred at 60 ° C. After confirming that there was no undissolved raw material in the resin varnish and the resin varnish was transparent, the resin varnish was recovered.
- Cyclopentanone solvent, dielectric filler and dispersant were weighed respectively.
- the weighed solvent, dielectric filler and dispersant were slurryed with a disperser.
- the resin varnish was weighed so that the final dielectric filler had the compounding ratio (weight ratio) shown in Tables 1A and 1B, and kneaded together with the dielectric filler-containing slurry by a disperser. .. It was confirmed that the dielectric filler was not aggregated after kneading. In this way, a coating liquid containing the resin composition constituting the adhesive layer was obtained.
- the surface of these resin films was roughened. Specifically, corona discharge treatment was applied to Aramika, and plasma treatment was applied to apical.
- Example 6 the coated resin surfaces of the two copper foils with adhesive layers were stacked so as to face each other without using a resin film, and vacuum pressed at 180 ° C. for 120 minutes to bring the adhesive layer into a cured state. , A double-sided copper-clad laminate was obtained.
- ⁇ Evaluation 1 Surface texture parameters of copper foil>
- OLS5000 manufactured by Olympus Corporation
- the roughened surface of the roughened copper foil described in (3) above was measured in accordance with ISO25178.
- the surface profile of a region having an area of 16384 ⁇ m 2 on the roughened surface of the roughened copper foil was measured with the above laser microscope with a 100x lens having a numerical aperture (NA) of 0.95.
- NA numerical aperture
- various parameters of Sp, Sdq and Sk were measured by surface texture analysis. All of these Sp, Sdq and Sk were measured with the cutoff wavelength of the S filter set to 0.55 ⁇ m and the cutoff wavelength of the L filter set to 10 ⁇ m. The results were as shown in Tables 1A and 1B.
- ⁇ Evaluation 2 Capacitance (Cp)> After etching one side of a double-sided copper-clad laminate to form a circular circuit with a diameter of 0.5 inches (12.6 mm), a frequency of 1 MHz is used with an LCR meter (LCR HiTester 3532-50, manufactured by Hioki Electric Co., Ltd.). The capacitance was measured in. This measurement was performed according to IPC-TM-650 2.5.2. The measured capacitance was evaluated according to the following criteria. The results are as shown in Table 2.
- -Evaluation A 10.0nF / in 2 or more (best) -Evaluation B: 5.0 nF / in 2 or more and less than 10.0 nF / in 2 (good) -Evaluation C: 1.0 nF / in 2 or more and less than 5.0 nF / in 2 (possible) -Evaluation D: 1.0 nF / in less than 2 (impossible)
- ⁇ Evaluation 3 Dielectric breakdown voltage (BDV)> After etching one side of a double-sided copper-clad laminate to form a circular circuit with a diameter of 0.5 inches (12.6 mm), boost the voltage with an insulation resistance measuring instrument (super insulation meter SM7110 manufactured by Hioki Electric Co., Ltd.). The breakdown voltage was measured under the condition of a speed of 167 V / sec. This measurement was performed according to IPC-TM-650 2.5.6.2a. The measured breakdown voltage was evaluated according to the following criteria. The results are as shown in Table 2.
- ⁇ Evaluation 4 Dielectric breakdown strength> The breakdown voltage (BDV) measured in Evaluation 3 was divided by the thickness of the dielectric layer (the thickness of the resin film having the adhesive layer) to calculate the value. The calculated dielectric breakdown strength was evaluated according to the following criteria. Results were as shown in Table 2-Evaluation A: Greater than 220 kV / mm (best) -Evaluation B: Greater than 200 kV / mm and 220 kV / mm or less (good) -Evaluation C: Greater than 100 kV / mm and 200 kV / mm or less (possible) -Evaluation D: 100 kV / mm or less (impossible)
- ⁇ Evaluation 5 Normal peel strength (circuit adhesion)> After etching one side of a double-sided copper-clad laminate to form a linear circuit with a width of 3 mm, the circuit is peeled off at a peeling speed of 50 mm / min using an autograph, and the peeling strength is set to room temperature (for example, 25 ° C.). Measured at. This measurement was performed according to IPC-TM-650 2.4.8. The measured normal peel strength was evaluated according to the following criteria. The results are as shown in Table 2.
- Relative permittivity at 1 MHz is 6.5 or more-Evaluation
- B Relative permittivity at 1 MHz is 5.0 or more and less than 6.5-Evaluation
- C Relative permittivity at 1 MHz is 2.5 or more and less than 5.0
- D Relative permittivity at 1 MHz is less than 2.5
- ⁇ Evaluation 7 Bonded state> After cutting out a double-sided copper-clad laminate to a size of about 8 mm in width and 5 mm in length, a cross section is cut out in the thickness direction of the double-sided copper-clad laminate using a microtome (Leica Biosystems, RM2265, fully automatic universal rotary microtome). Was exposed. The cross section was observed with an optical microscope (Leica Microsystems, Leica DM LM) to confirm whether the copper foil and the film were normally bonded by the adhesive layer. The quality of the confirmed bonding condition was evaluated according to the following criteria. The results are as shown in Table 2. The cross-sectional observation image of the cross section of the double-sided copper-clad laminate obtained in FIG.
- Example 4 was obtained in the same manner as in Example 5 except that the thickness of the copper foil was changed to 12 ⁇ m in FIG.
- the cross-sectional observation image of the cross section of the double-sided copper-clad laminate is shown in the dark field.
- -Good The adhesive layer is evenly present between the copper foil surface and the resin film.
- -Defective The adhesive layer is non-uniform between the copper foil surface and the resin film (the adhesive layer has holes or the copper foil surface is directly bonded to the resin film).
Abstract
Description
前記樹脂フィルムは、25℃で硬化状態であり、
前記銅箔はいずれも、前記接着層に接する側の面の、ISO25178に準拠して測定される最大山高さSpが0.05μm以上3.3μm以下である、両面銅張積層板が提供される。
前記樹脂フィルムは、25℃で硬化状態であり、
前記銅箔はいずれも、前記接着層に接する側の面の、ISO25178に準拠して測定される二乗平均平方根勾配Sdqが0.01以上2.3以下である、両面銅張積層板が提供される。
本発明を特定するために用いられるパラメータの定義を以下に示す。
本発明の両面銅張積層板は、樹脂フィルムの両面に、それぞれ接着層及び銅箔を順に備える。樹脂フィルムは、25℃で硬化状態である。銅箔はいずれも、接着層に接する側の面において、ISO25178に準拠して測定される最大山高さSpが0.05μm以上3.3μm以下であるか、又はISO25178に準拠して測定される二乗平均平方根勾配Sdqが0.01以上2.3以下である。このように、銅箔の接着層に接する側の面のSp又はSdqを制御すること、すなわち、銅箔の表面性状を制御することにより、キャパシタとして用いた場合に、高いキャパシタ容量を確保しながら、耐電圧性及び剥離強度において優れた特性を発揮することができる。
(1)樹脂ワニスの調製
まず、樹脂ワニス用原料成分として、以下に示される樹脂成分及びイミダゾール系硬化促進剤を用意した。
‐ ビフェニル-アラルキル型エポキシ樹脂:日本化薬株式会社製、NC-3000
‐ 多官能フェノール樹脂(硬化剤):明和化成株式会社製、MEH-7500
‐ フェノール性水酸基含有ポリブタジエン変性芳香族ポリアミド樹脂:日本化薬株式会社製、BPAM-155
‐ イミダゾール系エポキシ樹脂硬化促進剤:四国化成工業株式会社製、2P4MHZ
続いて、以下に示される誘電体フィラー及び分散剤を用意した。
‐ チタン酸バリウム:日本化学工業株式会社製
‐ チタネート系カップリング剤:味の素ファインテクノ株式会社製、KR-44(誘電体フィラー100重量部に対して添加量1.5重量部)
上記塗工液を塗工するための銅箔として、粗化処理銅箔を用意した。この銅箔の製造は、特許文献4や特許文献5等に開示されるような公知の方法により行った。
上記(2)で得られた塗工液を上記(3)に記載の銅箔に乾燥後の接着層の厚さが表1A及び1Bに示されるものとなるようにバーコーターを用いて塗工し、その後130℃に加熱したオーブンにて3分間乾燥させ、樹脂を半硬化状態とした。こうして接着層付銅箔を得た。
以下に示される樹脂フィルムを用意した。
‐ アラミドフィルム:帝人アドバンストフィルム社製、アラミカ
‐ ポリイミドフィルム:株式会社カネカ製、アピカル
例1~5においては、接着層付銅箔の塗工樹脂面を上向きに載置し、その塗工樹脂面に樹脂フィルムを重ねた。さらに、その樹脂フィルムの塗工樹脂面と接していない側の表面に、塗工樹脂面を下にした接着層付銅箔を重ねた。このとき、180℃で120分間真空プレスを行い、接着層を硬化状態とした。こうして、両面銅張積層板を得た。
銅箔及び得られた両面銅張積層板について以下の各種評価を行った。
レーザー顕微鏡(オリンパス株式会社製、OLS5000)を用いた表面粗さ解析により、上記(3)の粗化処理銅箔の粗化処理面の測定をISO25178に準拠して行った。具体的には、粗化処理銅箔の粗化処理面における面積16384μm2の領域の表面プロファイルを、上記レーザー顕微鏡にて開口数(N.A.)0.95の100倍レンズで測定した。得られた粗化処理面の表面プロファイルに対してノイズ除去と1次線形面傾き補正を行った後、表面性状解析によりSp、Sdq及びSkuの各種パラメータの測定を実施した。これらのSp、Sdq及びSkuはいずれもSフィルタによるカットオフ波長を0.55μmとし、Lフィルタによるカットオフ波長を10μmとして計測した。結果は表1A及び1Bに示されるとおりであった。
両面銅張積層板の片面にエッチングを施して直径0.5インチ(12.6mm)の円形の回路を作製した後、LCRメーター(日置電機株式会社製、LCRハイテスタ3532-50)にて周波数1MHzにおける静電容量を測定した。この測定はIPC-TM-650 2.5.2に準拠して行った。測定された静電容量を以下の基準に従い評価した。結果は表2に示されるとおりであった。
‐評価A:10.0nF/in2以上(最良)
‐評価B:5.0nF/in2以上でかつ10.0nF/in2未満(良)
‐評価C:1.0nF/in2以上でかつ5.0nF/in2未満(可)
‐評価D:1.0nF/in2未満(不可)
両面銅張積層板の片面にエッチングを施して直径0.5インチ(12.6mm)の円形の回路を作製した後、絶縁抵抗測定器(日置電機株式会社製、超絶縁計SM7110)にて昇圧速度167V/sec条件下での絶縁破壊電圧を測定した。この測定はIPC-TM-650 2.5.6.2aに準拠して行った。測定された絶縁破壊電圧を以下の基準に従い評価した。結果は表2に示されるとおりであった。
‐評価A:5000Vより大きい(最良)
‐評価B:3500Vより大きくかつ5000V以下(良)
‐評価C:2000Vより大きくかつ3500V以下(可)
‐評価D:2000V以下(不可)
評価3で測定した絶縁破壊電圧(BDV)を誘電体層厚さ(接着層を有する樹脂フィルムの厚さ)で割り、値を算出した。算出された絶縁破壊強度を以下の基準に従い評価した。結果は表2に示されるとおりであった
‐評価A:220kV/mmより大きい(最良)
‐評価B:200kV/mmより大きくかつ220kV/mm以下(良)
‐評価C:100kV/mmより大きくかつ200kV/mm以下(可)
‐評価D:100kV/mm以下(不可)
両面銅張積層板の片面にエッチングを施して3mm幅の直線状の回路を作製した後、オートグラフにて引き剥がし速度50mm/分で回路を引き剥がし、その剥離強度を常温(例えば25℃)で測定した。この測定はIPC-TM-650 2.4.8に準拠して行った。測定された常態剥離強度を以下の基準に従い評価した。結果は表2に示されるとおりであった。
‐評価A:1.5kgf/cm以上(最良)
‐評価B:1.0kgf/cm以上でかつ1.5kgf/cm未満(良)
‐評価C:0.6kgf/cm以上でかつ1.0kgf/cm未満(可)
‐評価D:0.6kgf/cm未満(不可)
両面銅張積層板の両面の銅を全てエッチングにより除去して、接着層を有する樹脂フィルム(接着層及び樹脂フィルムの組合せ)を得た。この接着層を有する樹脂フィルムについて、評価2で測定した静電容量(Cp)と、Cp=ε0×Dk×(S/d)(式中、ε0は真空の誘電率、Sは円形回路の面積、dは誘電体層の厚みである)の式を用いることにより、1MHzにおける比誘電率を測定した。算出された比誘電率を以下の基準に従い評価した。結果は表2に示されるとおりであった。
‐評価A:1MHzにおける比誘電率が6.5以上
‐評価B:1MHzにおける比誘電率が5.0以上6.5未満
‐評価C:1MHzにおける比誘電率が2.5以上5.0未満
‐評価D:1MHzにおける比誘電率が2.5未満
両面銅張積層板を幅8mm、長さ5mm程度のサイズに切り出した後、ミクロトーム(Leica Biosystems、RM2265、全自動万能型回転ミクロトーム)を用いて両面銅張積層板の厚さ方向に切り出して断面を露出させた。その断面を光学顕微鏡(Leica Microsystems、Leica DM LM)で観察し、銅箔とフィルムが接着層により正常に貼り合わせられているか否かの確認を行った。確認した貼り合わせ状態の良否を以下の基準に従い評価した。結果は表2に示されるとおりであった。図1に例4において得られた両面銅張積層板の断面の暗視野の断面観察像を、図2に銅箔の厚さを12μmに変更したこと以外は例5と同様にして得られた両面銅張積層板の断面の暗視野の断面観察像をそれぞれ示す。
‐良好:接着層が銅箔表面と樹脂フィルムの間に均一に存在する。
‐不良:接着層が銅箔表面と樹脂フィルムの間で不均一である(接着層に空孔がある、あるいは銅箔表面が樹脂フィルムに直接接合している)。
Claims (12)
- 樹脂フィルムの両面に、それぞれ接着層及び銅箔を順に備えた両面銅張積層板であって、
前記樹脂フィルムは、25℃で硬化状態であり、
前記銅箔はいずれも、前記接着層に接する側の面の、ISO25178に準拠して測定される最大山高さSpが0.05μm以上3.3μm以下である、両面銅張積層板。 - 樹脂フィルムの両面に、それぞれ接着層及び銅箔を順に備えた両面銅張積層板であって、
前記樹脂フィルムは、25℃で硬化状態であり、
前記銅箔はいずれも、前記接着層に接する側の面の、ISO25178に準拠して測定される二乗平均平方根勾配Sdqが0.01以上2.3以下である、両面銅張積層板。 - 前記接着層及び前記樹脂フィルムの組合せは、硬化後の周波数1MHzにおける比誘電率が2.5以上30以下である、請求項1又は2に記載の両面銅張積層板。
- 前記樹脂フィルムは、硬化後の周波数1MHzにおける比誘電率が2以上30以下である、請求項1~3のいずれか一項に記載の両面銅張積層板。
- 前記接着層は、硬化後の周波数1MHzにおける比誘電率が2.5以上30以下である、請求項1~4のいずれか一項に記載の両面銅張積層板。
- 前記樹脂フィルムの厚さが0.5μm以上30μm以下である、請求項1~5のいずれか一項に記載の両面銅張積層板。
- 前記樹脂フィルムが、エポキシ樹脂、ポリエチレンテレフタレート、ポリエチレンナフタレート、ポリビニルカルバゾール、ポリフェニレンサルファイド、ポリイミド、ポリアミド、芳香族ポリアミド、ポリアミドイミド、ポリエーテルサルフォン、ポリエーテルニトリル、ポリエーテルエーテルケトン、及びポリテトラフルオロエチレンからなる群から選択される少なくとも1種を含む、請求項1~6のいずれか一項に記載の両面銅張積層板。
- 前記接着層が、熱可塑性の成分及び/又は熱硬化性の成分で構成される樹脂成分を含み、前記樹脂成分がエポキシ樹脂、ポリエチレンテレフタレート樹脂、ポリエチレンナフタレート樹脂、ポリビニルカルバゾール樹脂、ポリフェニレンサルファイド樹脂、ポリアミド樹脂、芳香族ポリアミド樹脂、ポリアミドイミド樹脂、ポリイミド樹脂、ポリエーテルサルフォン樹脂、ポリエーテルニトリル樹脂、ポリエーテルエーテルケトン樹脂、ポリテトラフルオロエチレン樹脂、ウレタン樹脂、イソシアネート樹脂、活性エステル樹脂、フェノール樹脂、及びジアミン化合物からなる群から選択される少なくとも1種を含む、請求項1~7のいずれか一項に記載の両面銅張積層板。
- 前記接着層は、Ba、Ti、Sr、Pb、Zr、La、Ta、Ca及びBiからなる群から選択される少なくとも2種を含有する複合金属酸化物である誘電体フィラーをさらに含む、請求項1~8のいずれか一項に記載の両面銅張積層板。
- 前記複合金属酸化物が、BaTiO3、SrTiO3、Pb(Zr,Ti)O3、PbLaTiO3、PbLaZrO、及びSrBi2Ta2O9からなる群から選択される少なくとも1種を含む、請求項9に記載の両面銅張積層板。
- 前記銅箔はいずれも、前記接着層に接する側の面の、ISO25178に準拠して測定されるクルトシスSkuが2.6以上4.0以下である、請求項1~10のいずれか一項に記載の両面銅張積層板。
- IPC-TM650-2.4.6.Cに準拠して測定される、前記銅箔及び前記樹脂フィルム間の剥離強度が、0.5kgf/cm以上4.0kgf/cm以下である、請求項1~11のいずれか一項に記載の両面銅張積層板。
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